Electric cluster lamp



Nov. 30, 1926.

G. A. BOOMER ELECTRIC CLUSTER LAMP 'Filed July 6 1925' Patented Nov. 30, 1926.

UNITED STATES PATENT OFFICE.

GEORGE A. BOOMER, OF WATERBURY, CONNECTICUT, ASSIGNOR TO THE PLUME & ATWOOD MFG. 00., OF W'ATERBURY, CONNECTICUT, A CORPORATION.

ELECTRIC CLUSTER LAMP.

Application filed July 6, 1925.

Fig. 1 is a side View of a cluster-lamp constructed in accordance with my invention.

Fig. 2 is an enlarged, sectional view of the same.

Fig. 3 is a broken, inside view of the cup, showing one of the nipples mounted therein looking in the direction of the arrow 3 in Fig. 2.

This invention relates to improvement in electric cluster-lamps, either table or floor lamps. These cluster-lamps are usually used with ornamental shades of some character It the diameter of the shade permits, it is desirable that the lamps should extend in a horizontal position. On the other hand, with a small shade, it is necessary that they should be inclined downward. The object of this invention is to so mount the lamp sockets as to permit them to be adjustable with relation to the standard, and the invention consists in the construction as here inatter described and particularly recited in the claim.

In carrying out my invention, I employ a tubular post 5, adapted to be secured to the upper end of a table lamp or floor lamp. At the upper end of the post is a cup v6 formed with openings 7, the edges of the opening being turned outward to form seats for hollow spherically-contoured stems 8, to which la11no-sockets 9 of usual construction may be attached. These stems are held in place by plates 10 having curved flanges 11 to set over the inner ends of the stems, and these plates are secured to the cup by screws 12, so as to form a universal joint. The stems may be turned so as to extend in any desired direction, according to the character of the shade used. The plates when thus secured in place t'rictionally clamp the socket in place, so that the lamp can be turned to any desired position. The edges of the opening in the cup prevent the stem from being turned above a horizontal position.

It will be understood that the Wires going up through the post pass through the stems to the sockets in the usual manner.

Serial No. 1,694.

The cup is closed by the usual removable cap 13 having a flat top 14 forming a seat for the shade, which is centered by the base 15 of a ball or other ornamental tip 16.

While I have shown two lamp sockets mounted in accordance with my invention,

it is obvious that three, four, or any number of sockets may be similarly mounted in a cluster, the number being determined by the size of the cup. I am aware that a clusterlamp fixture of the type herein shown and described is old and also that it is old to provide the sockets of such cluster-lamp fixtures with stems having spherically-contoured terminals which are frictionallygripped to hold the lamp-sockets in a variety of positions with respect to the standard of In a lamp-fixture, the combination with a cup-like junction-box having a lateral opening, of a removable cover for the said box, a friction-plate secured to the said box against edgewise displacement with respect thereto and having an opening aligned with the 30 said lateral opening thereof, a lamp-socket provided with a hollow stem having a s )herica1ly-contoured terminal respectively engaged at points on opposite sides of its largest diameter by the wall adjacent to the opening in the said box and by the wall adjacent to the opening in the said frictionplate, and adjustable means for springing the said plate fiat-wise toward the box in a line parallel with the axes of the said openings to vary the amount of friction developed between the said terminal, box and plate.

In testimony whereof, I have signed this specification.

GEORGE A. BOOMER.

I do not, therefore, claim such a 70 

